ORA-06502 JNI.CALL_STRING_METHOD Oracle Forms & Web Services

Question

Hello:
A customer of us has been integrating Oracle Forms 10g and Web Services.
There is a java class named WsGenQueryStub. That java class has been generated using Oracle JDeveloper.
It implements the consume of a Web Service That class has a method named GetDat which receives 2 input parameters which are of VARCHAR2 type, containing XML text.
This method returns an XML text string which may have more than 4000 characters .
That class is incluedd at forms application by using the "Import Java Class" feature.
Forms builds a package named WsGenQueryStub which includes the following funtion
-- Method: GetData (Ljava/lang/String;Ljava/lang/String;)Ljava/lang/String;
FUNCTION GetData(
obj ORA_JAVA.JOBJECT,
a0 VARCHAR2,
a1 VARCHAR2) RETURN VARCHAR2 IS
BEGIN
args := JNI.CREATE_ARG_LIST(2);
JNI.ADD_STRING_ARG(args, a0);
JNI.ADD_STRING_ARG(args, a1);
RETURN JNI.CALL_STRING_METHOD(FALSE, obj, 'Interfases/WsGenQueryStub', 'GetData', '(Ljava/lang/String;Ljava/lang/String;)Ljava/lang/String;', args);
END;
Forms Version is 9.0.4.0.19 , and PL/SQL version ( of forms ) is 9.0.1.5.1 , both support variables of type VARCHAR2 up to 32767 characters long
However when the form is run the line
RETURN JNI.CALL_STRING_METHOD(FALSE, obj, 'Interfases/WsGenQueryStub', 'GetData', '(Ljava/lang/String;Ljava/lang/String;)Ljava/lang/String;', args);
gets the ORA-06502 error when the returned text is longer than 4000 characters
I thank your answers.
Fernando.

Answer 1

Ferdo,
could you split up the result string in chunks that don't exceed the max. length? A method exposed on the Java class to could do this and be called from Forms as long as there is data coming.
Frank